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I found the same problem. It's cause the firing triggers on the grenades are inset rather then flush like most other grenades. I personally just sold mine and bought madbulls, which is what I should have done in the first place. But you could glue a spacer on the grenade trigger to bring it flush with the grenade base. That would likely fix the issue.
As to what grenades are compatible, ca grenades are good obviously, as are madbulls. I haven't tried any others, but I figure any that have their triggers flush rather then inset would be ok.
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